package com.lc.reader.domain.service

import android.content.Context
import com.lc.reader.data.model.Book
import com.lc.reader.data.model.Chapter
import java.io.File

interface BookParserService {
    suspend fun parseBook(file: File): Book?
    suspend fun getChapters(book: Book): List<Chapter>
    suspend fun getPageContent(book: Book, pageNumber: Int): String?
    suspend fun getTotalPages(book: Book): Int
}

class BookParserServiceImpl(
    private val context: Context
) : BookParserService {
    
    override suspend fun parseBook(file: File): Book? {
        return try {
            val format = getFileFormat(file.name)
            val fileSize = file.length()
            
            // 根据文件格式选择不同的解析器
            val bookInfo = when (format.lowercase()) {
                "epub" -> parseEpubFile(file)
                "pdf" -> parsePdfFile(file)
                "txt" -> parseTxtFile(file)
                else -> null
            }
            
            bookInfo?.copy(
                filePath = file.absolutePath,
                fileSize = fileSize,
                format = format
            )
        } catch (e: Exception) {
            e.printStackTrace()
            null
        }
    }
    
    override suspend fun getChapters(book: Book): List<Chapter> {
        // 实现章节解析逻辑
        return emptyList()
    }
    
    override suspend fun getPageContent(book: Book, pageNumber: Int): String? {
        // 实现页面内容获取逻辑
        return null
    }
    
    override suspend fun getTotalPages(book: Book): Int {
        // 实现总页数计算逻辑
        return 0
    }
    
    private fun getFileFormat(fileName: String): String {
        return fileName.substringAfterLast('.', "").lowercase()
    }
    
    private fun parseEpubFile(file: File): Book? {
        // EPUB解析逻辑
        return Book(
            title = file.nameWithoutExtension,
            author = "未知作者",
            filePath = file.absolutePath,
            fileSize = file.length(),
            format = "EPUB"
        )
    }
    
    private fun parsePdfFile(file: File): Book? {
        // PDF解析逻辑
        return Book(
            title = file.nameWithoutExtension,
            author = "未知作者",
            filePath = file.absolutePath,
            fileSize = file.length(),
            format = "PDF"
        )
    }
    
    private fun parseTxtFile(file: File): Book? {
        // TXT解析逻辑
        return Book(
            title = file.nameWithoutExtension,
            author = "未知作者",
            filePath = file.absolutePath,
            fileSize = file.length(),
            format = "TXT"
        )
    }
}
